You have to download a mutation mod from l4dmaps in order to play a 4-players game with only Tanks. Custom mutions only have the "TAAAAANK!!!" mode, which is for 8-players (Versus), where every SI is a Tank.

You have to download a mutation mod from l4dmaps in order to play a 4-players game with only Tanks. Custom mutions only have the "TAAAAANK!!!" mode, which is for 8-players (Versus), where every SI is a Tank.